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The dinuclear scandium(III) cyclooctatetraenyl chloride complex di-μ-chlorido-bis[(η 8-cyclooctatetraene)(tetrahydrofuran-κO)scandium(III)]

The dinuclear scandium(III) cyclooctatetraenyl chloride complex di-μ-chlorido-bis[(η 8-cyclooctatetraene)(tetrahydrofuran-κO)scandium(III)]

Zheng Zhou, Joshua Greenough, Zheng Wei, Marina A Petrukhina

Acta Crystallogr C Struct Chem. 2017 May 1;73(Pt 5):420-423.

PMID: 28469069

Abstract:

Only a few cyclooctatetraene dianion (COT) π-complexes of lanthanides have been crystallographically characterized. This first single-crystal X-ray diffraction characterization of a scandium(III) COT chloride complex, namely di-μ-chlorido-bis[(η8-cyclooctatetraene)(tetrahydrofuran-κO)scandium(III)], [Sc2(C8H8)2Cl2(C4H8O)2] or [Sc(COT)Cl(THF)]2 (THF is tetrahydrofuran), (1), reveals a dimeric molecular structure with symmetric chloride bridges [average Sc-Cl = 2.5972 (7) Å] and a η8-bound COT ligand. The COT ring is planar, with an average C-C bond length of 1.399 (3) Å. The Sc-C bond lengths range from 2.417 (2) to 2.438 (2) Å [average 2.427 (2) Å]. Direct comparison of (1) with the known lanthanide (Ln) analogues (La, Ce, Pr, Nd, and Sm) illustrates the effect of metal-ion (M) size on molecular structure. Overall, the M-Cl, M-O, and M-C bond lengths in (1) are the shortest in the series. In addition, only one THF molecule completes the coordination environment of the small ScIII ion, in contrast to the previously reported dinuclear Ln-COT-Cl complexes, which all have two bound THF molecules per metal atom.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10361849	Scandium(III) chloride		10361-84-9	Price

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